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#ifndef FRAMEBUFFER_H_
#define FRAMEBUFFER_H_
#include <stdint.h> /* uint8_t */
#include <stddef.h> /* wchar_t */
#include <sys/types.h> /* ssize_t */
/* Globals for the terminal size, set by term_update_size() */
extern size_t term_width, term_height;
extern struct termios initial_terminal_state;
/* Represents a 24 bit colour, 8 bit per channel */
typedef struct Colour_s {
uint8_t r, g, b;
} Colour;
/* Basic colours */
#define C_BLACK (Colour){0, 0, 0}
#define C_WHITE (Colour){255, 255, 255}
#define C_RED (Colour){255, 0, 0}
#define C_GREEN (Colour){0, 255, 0}
#define C_BLUE (Colour){0, 0, 255}
#define C_YELLOW (Colour){255, 255, 0}
#define C_CYAN (Colour){0, 255, 255}
#define C_MAGENTA (Colour){255, 0, 255}
/* One 'pixel' of the image, AKA one character in the terminal.
* For a solid colour pixel, set ch to a space and change the bg colour */
typedef struct Pixel_s {
Colour fg, bg;
wchar_t ch; /* the char of the pixel */
} Pixel;
/* Solid colour pixels */
#define P_BLACK (Pixel){C_BLACK, C_BLACK, ' '}
#define P_WHITE (Pixel){C_WHITE, C_WHITE, ' '}
#define P_RED (Pixel){C_RED, C_RED, ' '}
#define P_GREEN (Pixel){C_GREEN, C_GREEN, ' '}
#define P_BLUE (Pixel){C_BLUE, C_BLUE, ' '}
#define P_YELLOW (Pixel){C_YELLOW, C_YELLOW, ' '}
#define P_CYAN (Pixel){C_CYAN, C_CYAN, ' '}
#define P_MAGENTA (Pixel){C_MAGENTA, C_MAGENTA, ' '}
typedef struct Framebuffer_s {
Pixel **fb; /* Adressed as fb[row][col] or fb[x][y] */
size_t width, height;
char *print_buf; /* is of size (42 * width * height)
* 42 is ANSI 24-bit fg and bg + one wchar_t */
} Framebuffer;
/* Check if fb == NULL in case malloc() fails */
Framebuffer fb_new(size_t width, size_t height);
void fb_free(Framebuffer *fb);
/* Fills fb with pixel */
void fb_fill(Framebuffer fb, Pixel pixel);
/* Fills fb with black */
#define fb_clear(fb) fb_fill(fb, P_BLACK)
/* Puts a pixel onto fb in a specified position */
void fb_put(Framebuffer fb, size_t row, size_t col, Pixel pixel);
/* Draws a vertical line to fb on col x, from y1 to y2 */
void fb_vert_line(Framebuffer fb, size_t x, size_t y1, size_t y2, Pixel pixel);
/* Puts s onto fb in position (x, y) with given colour. s has to be null-terminated.
* x is of type long to handle text 'origin' being lefter than the left edge when x < 0 */
void fb_text(Framebuffer fb, long x, size_t y, char *s, Colour fg, Colour bg);
/* Same as above, but the background is 'transparent' */
void fb_text_no_bg(Framebuffer fb, long x, size_t y, char *s, Colour fg);
/* Initializes the terminal and sets TERM_WIDTH and TERM_HEIGHT */
void term_init(void);
/* Undoes everything fb_init() did */
void term_cleanup(void);
/* Updates term_width and term_height */
void term_update_size(void);
/* Prints fb to the screen */
void fb_print(Framebuffer fb);
static inline void set_fg(Colour col);
static inline void set_bg(Colour col);
#define get_input(c) read(STDIN_FILENO, &c, 1)
#endif /* FRAMEBUFFER_H_ */
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